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| Experimental study on influence of canal water on freezing process of canal foundation soil in cold and arid regions |
| SUN Wen1, SONG Ling1*, XU Qingfeng2, CHEN Xinrui1, YANG Yukun3 |
| 1. College of Water & Architectural Engineering, Shihezi University, Shihezi, Xinjiang 832003, China; 2. Hongshanzui Power Plant of Tianfu Energy Co. Ltd., Shihezi, Xinjiang 832000, China; 3. College of Mechanical and Electrical Engineering, Shihezi, University, Shihezi, Xinjiang 832003, China |
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Abstract An indoor model test of the water-stop canal and the water-supply canal under the open system was carried out by using the frost-expansion device composed of the cabinet, the cooling space, the water supplement system and the measurement system. The changes of the temperature field of the canal foundation soil, the moisture content after freezing and the replenishment of the Markov flask during freezing are studied. The test results show that the shape of the canal section and the water in the canal affect the distribution of the temperature field of the canal soil, the shape and density of the isotherms of the stop-water canal and the water-supply canal near the trench are different, the tempe-rature field distribution of the canal foundation soil is uneven, the overwater canal only has negative temperature in the foundation soil above the water level line. The cumulative water replenishment vo-lume of the Markov bottle in the water-off canal and the water-passing canal is 16 873 mL and 16 051 mL, respectively. The replenishment of the Markov bottle consists of three stages: rapid replenish-ment, slow replenishment rate and stop replenishment. Compared with the initial moisture content of 17%, regardless of whether there is water in the canal, the value of water content increases after free-zing down from the top of the canal along the slope of the canal. In engineering design and theoretical calculation, the impact of changes in operation mode on canal freezing should be considered separately.
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Received: 05 July 2020
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